Capsaicin / Capsimax

Chili heat with a small, real thermogenic and appetite effect — and a genuine topical pain use.

Overall grade: Grade C
Last revised: Jul 10, 2026; 2
graded outcomes: 0
references listed

A structured monograph in Prometheus's bundled library. Its grades are the monograph's own reading of the evidence, not a peer-reviewed review.

1 at grade B · 1 at grade C — 2 graded rows

What is known

Each outcome with its grade (how strong the evidence is, A to D), the size of the effect where the entry records one, and how often studies agree.

Outcome	Grade	Effect size	Agreement
Neuropathic / OA pain (topical)Established	Evidence grade B	Moderate	high
Energy expenditure / fat oxidationMinor	Evidence grade C	Small	high

Neuropathic / OA pain (topical)Evidence grade B
Established
Moderatehigh
Energy expenditure / fat oxidationEvidence grade C
Minor
Smallhigh

What is uncertain

Read off the same rows as above. Nothing here is added that the entry does not itself record.

Thin evidence: Energy expenditure / fat oxidation (grade C).

The evidence in words

What it is

Capsaicin is the pungent compound in chili peppers; capsaicinoid extracts (e.g., Capsimax) are used for metabolism, and topical capsaicin for pain.

How it works

It activates TRPV1 receptors, modestly raising energy expenditure and fat oxidation and reducing appetite; topically it desensitizes pain fibers.

What the evidence shows

Meta-analyses show small increases in energy expenditure and fat oxidation and modest appetite reduction — real but minor for weight. Topical capsaicin has solid evidence for neuropathic and osteoarthritis pain.

Safety & interactions

GI burning at high oral doses; topical can sting. Beadlet forms reduce oral discomfort.

Bottom line

A minor metabolic nudge and appetite blunter orally; a genuinely useful topical for certain pain. Don't expect real weight loss from capsules.

Entries that share this one's tags or conditions.

Capsaicin / Capsimax for Energy expenditure / fat oxidationEvidence grade C — MinorEvidence grade C
Capsaicin / Capsimax for Neuropathic / OA pain (topical)Evidence grade B — EstablishedEvidence grade B
Capsaicin / Capsimax: side effects, safety & interactionsGI burning at high oral doses; topical can sting. Beadlet forms reduce oral discomfort.Evidence grade C
SynephrineThe 'bitter orange' stimulant that replaced ephedra — mild thermogenic effect, real cardiovascular caution.Evidence grade C

Sources

This entry lists no references of its own.

Last revised Jul 10, 2026. A grade is this entry's reading of the evidence, not medical advice.